Diavik Diamond Mines Inc. P.O. Box 2498 5007 – 50th Avenue...

Diavik Diamond Mines Inc. P.O. Box 2498 5007 – 50th Avenue Yellowknife, NT X1A 2P8 Canada T (867) 669 6500 F (867) 669 9058

Document #: ENVI-336-0913 R0

Template #: DCON-036-1010 Registered in Canada of 2

Tracy Covey Resource Management Officer III Aboriginal Affairs and Northern Development Canada 140 Bristol Avenue, Yellowknife, NT Canada

2 September 2013

Our reference: HSEQMS Incident #88872 Your reference: W2007L2-0003 Dear Mr. Covey: Subject: 1645-18 Discharge Exceedance – Oil and Grease As required by Part A of the Surveillance Network Program (SNP) (amended August 12, 2013) (Water License W2007L2-0003), treated effluent from the North Inlet Water Treatment Plant (NIWTP) is sampled every six days for parameters specified in the SNP. The SNP further specifies that when effluent from the Sewage Treatment Facilities is directed to Lac de Gras additional analysis is required, including Oil and Grease. Treated sewage effluent is discharged into the Processed Kimberlite Containment (PKC) Facility. Water is currently being transferred from the PKC to the North Inlet. Effluent samples from both 1645-18 and 1645-18B were collected on the morning of August 14, 2013. Analytical results were received and uploaded into Diavik’s database on August 30, 2013. The database checks and validates analytical data against Water License Effluent Quality Criteria (EQC’s) (Part H Item 6). Oil and Grease in effluent from Plant 1 (1645-18) was recorded at 16 mg/L exceeding the EQC of 5 mg/L. Effluent from Plant 2 (1645-18B) did not have detectible concentrations of Oil and Grease. Immediate Response

1. Diavik has requested that the analytical laboratory recheck the results and determine if potential QA/QC issues may have been present during analysis – Ongoing.

2. Diavik has requested that analytical testing from samples collected at 1645-18 and 1645-18B on August 26 be expedited by the laboratory – Ongoing.

3. NIWTP staff inspected and checked all gearboxes and motors in the plant for oil leaks. None were discovered – Complete.

4. NIWTP records were checked for maintenance prior to the event. No issues were discovered – Complete.

5. Data sheets were checked to ensure correct QA/QC procedures were followed during sample collection. No issues were discovered - Complete.

Effluent from both 1645-18 and 1645-18B has been analyzed for Oil and Grease over the past year (see Figure 1). Recent trends have shown that if Oil and Grease is detected in the effluent from one plant, then it is also detected in effluent from the other Plant. This was not the case on August 14 (<1 mg/L – 1645-18B). Effluent from both Plants was sampled again on August 19. Oil and Grease was not detected in effluent from either Plant (Figure 1)

Document #: ENVI-336-0913 R0

Template #: DCON-036-1010 Registered in Canada of 2

Figure 1: NIWTP Effluent Oil and Grease Concentrations, May 2012 – August 2013

Diavik conducted sampling of the effluent mixing zone at 1645-19 on the afternoon of August 14, 2013. On August 14 the Diavik Airport reported winds at less than 5 knots throughout the day. During sampling events the water at 1645-19 was calm. No hydrocarbon sheen or other anomalies were noted by field staff during sampling activities. Future Actions

1. Influent (1645-13) and Effluent (1645-18 and 1645-18B) from the NIWTP will be sampled for Oil and Grease every two days commencing September 1, 2013 until September 15, 2013. Analytical data will be analyzed to determine if further testing requirements are necessary.

2. The North Inlet influent area will be visually inspected each day until September 15, 2013. Closure Diavik is awaiting results from the analytical laboratory on Items 1 and 2 listed under the Immediate Response section above. These results, along with the additional Oil and Grease results will be forwarded to the Inspector and WLWB as they become available. If you have questions regarding the above please contact the undersigned. Yours sincerely

David Wells Superintendent, Environment Cc Ryan Fequet, Wek’eezhii Land and Water Board

Encl Analytical Reports – August 14 and August 19

0

2

4

6

8

10

12

14

16

18

21‐May‐12 10‐Jul‐12 29‐Aug‐12 18‐Oct‐12 7‐Dec‐12 26‐Jan‐13 17‐Mar‐13 6‐May‐13 25‐Jun‐13 14‐Aug‐13

1645‐18

1645‐18B

*Detection limit for Oil and Grease is 1 mg/L

*

Your P.O. #: K00909 Your Project #: SNP-A PO # K00909Your C.O.C. #: 08376682

Attention: DDMI EnvironmentDIAVIK DIAMOND MINES INC.P.O. BOX 24985007 - 50 AVE.YELLOWKNIFE, NTCANADA X1A 2P8

Report Date: 2013/08/28

CERTIFICATE OF ANALYSIS

MAXXAM JOB #: B373986Received: 2013/08/21, 09:40

Sample Matrix: Water# Samples Received: 4

Date DateAnalyses Quantity Extracted Analyzed Laboratory Method Analytical MethodAcidity pH 4.5 & pH 8.3 (as CaCO3) 4 N/A 2013/08/21 BBY6SOP-00037 S M - 2 3 1 0 B Alkalinity - Water 4 2013/08/22 2013/08/23 BBY6SOP-00026 S M 2 3 2 0 B Chloride by Automated Colourimetry 4 N/A 2013/08/22 BBY6SOP-00011 S M - 4 5 0 0 - C l - Carbon (DOC) - unfiltered/unpreserved 4 N/A 2013/08/22 BBY6SOP-00003 S M - 5 3 1 0 C Conductance - water 4 N/A 2013/08/23 BBY6SOP-00026 S M - 2 5 1 0 B Fluoride - Mining Clients 4 N/A 2013/08/22 BBY6SOP-00038 SM - 4500 F C Hardness Total (calculated as CaCO3) 4 N/A 2013/08/25 BBY7SOP-00002 EPA 6020A Hardness (calculated as CaCO3) 4 N/A 2013/08/27 BBY7SOP-00002 EPA 6020A Na, K, Ca, Mg, S by CRC ICPMS (diss.) 4 N/A 2013/08/27 BBY7SOP-00002 EPA 6020A Elements by ICPMS Low Level (dissolved) 4 N/A 2013/08/26 BBY7SOP-00002 EPA 6020A Na, K, Ca, Mg, S by CRC ICPMS (total) 4 N/A 2013/08/25 BBY7SOP-00002 EPA 6020A Elements by ICPMS Low Level (total) 4 N/A 2013/08/24 BBY7SOP-00002 EPA 6020A Nitrogen (Total) 4 2013/08/22 2013/08/23 BBY6SOP-00022 SM-4500N C Ammonia-N (Preserved) 4 N/A 2013/08/22 BBY6SOP-00009 S M - 4 5 0 0 N H 3 G Nitrate + Nitrite (N) 4 N/A 2013/08/22 BBY6SOP-00010 SM 4500NO3-I Nitrite (N) by CFA 4 N/A 2013/08/22 BBY6SOP-00010 EPA 353.2 Nitrogen - Nitrate (as N) 4 N/A 2013/08/23 BBY6SOP-00010 SM 4500NO3-I Filter and HNO3 Preserve for Metals 4 N/A 2013/08/22 BBY6WI-00001 EPA 200.2 pH Water 4 N/A 2013/08/23 BBY6SOP-00026 S M - 4 5 0 0 H + B Orthophosphate by Konelab 4 N/A 2013/08/22 BBY6SOP-00013 SM 4500 P E Sulphate by Automated Colourimetry 3 N/A 2013/08/22 BBY6SOP-00017 SM4500-SO42- E Sulphate by Automated Colourimetry 1 N/A 2013/08/23 BBY6SOP-00017 SM4500-SO42- E Total Dissolved Solids (Filt. Residue) 4 2013/08/21 2013/08/22 BBY6SOP-00033 SM 2540C TKN (Calc. TN, N/N) total 4 N/A 2013/08/23 BBY6SOP-00022 SM 4500N-C Carbon (Total Organic) 4 N/A 2013/08/22 BBY6SOP-00003 S M - 5 3 1 0 C Total Oil and Grease 2 N/A 2013/08/27 BBY8SOP-00004 BC Lab Manual Phosphorus-P (LL Tot, dissolved) - UF/UP 4 2013/08/22 2013/08/22 BBY6SOP-00013 SM-4500 PE Total Phosphorus 4 N/A 2013/08/23 BBY6SOP-00013 SM 4500 P E

* Results relate only to the items tested.

Maxxam Analytics International Corporation o/a Maxxam Analytics Burnaby: 4606 Canada Way V5G 1K5 Telephone(604) 734-7276 Fax(604) 731-2386

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DIAVIK DIAMOND MINES INC.Maxxam Job #: B373986 Client Project #: SNP-AReport Date: 2013/08/28

Your P.O. #: K00909Sampler Initials: CM

-2-

Encryption Key

Please direct all questions regarding this Certificate of Analysis to your Project Manager.

Tabitha Rudkin, Burnaby Project ManagerEmail: [email protected]# (604) 638-2639

====================================================================This report has been generated and distributed using a secure automated process.Maxxam has procedures in place to guard against improper use of the electronic signature and have the required "signatories", as per section5.10.2 of ISO/IEC 17025:2005(E), signing the reports. For Service Group specific validation please refer to the Validation Signature Page.

Total cover pages: 2


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RESULTS OF CHEMICAL ANALYSES OF WATER

Maxxam ID HG6772 HG6773 HG6774 HG6775Sampling Date 2013/08/14 2013/08/14 2013/08/14 2013/08/14

UNITS 1645-13-4 QC Batch 1645-13-5 1645-18 RDL 1645-18B RDL QC BatchMisc. InorganicsAcidity (pH 4.5) mg/L <0.50 7099709 <0.50 <0.50 0.50 <0.50 0.50 7099709Acidity (pH 8.3) mg/L <0.50 7099709 <0.50 1.41 0.50 1.95 0.50 7099709Fluoride (F) mg/L 0.130 7104501 0.130 0.120 0.010 0.110 0.010 7104501ANIONSNitrite (N) mg/L 0.0929(1) 7107193 0.0942(1) 0.0867(1) 0.0050 0.0962(1) 0.0050 7107193Calculated ParametersFilter and HNO3 Preservation N/A LAB 7105825 LAB LAB N/A LAB N/A 7105825Nitrate (N) mg/L 3.79 7099714 3.80 3.84 0.10 3.72 0.10 7099714Misc. InorganicsDissolved Organic Carbon (C) mg/L 2.31 7103884 2.12 1.98 0.50 1.70 0.50 7103884Alkalinity (Total as CaCO3) mg/L 51.9 7106012 51.6 41.5 0.50 40.1 0.50 7106012Total Organic Carbon (C) mg/L 2.33 7103881 2.30 2.45 0.50 2.16 0.50 7103881Alkalinity (PP as CaCO3) mg/L <0.50 7106012 <0.50 <0.50 0.50 <0.50 0.50 7106012Bicarbonate (HCO3) mg/L 63.4 7106012 63.0 50.7 0.50 49.0 0.50 7106012Carbonate (CO3) mg/L <0.50 7106012 <0.50 <0.50 0.50 <0.50 0.50 7106012Hydroxide (OH) mg/L <0.50 7106012 <0.50 <0.50 0.50 <0.50 0.50 7106012AnionsDissolved Sulphate (SO4) mg/L 73.3 7111863 73.0 84.6 0.50 85.9 0.50 7108894Dissolved Chloride (Cl) mg/L 74 7108789 72 73 0.50 72 0.50 7108789NutrientsAmmonia (N) mg/L 0.15 7104092 0.14 0.12 0.0050 0.14 0.0050 7104092Orthophosphate (P) mg/L 0.217(1) 7106630 0.206(1) 0.0097(1) 0.0050 <0.0050(1) 0.0050 7106630Dissolved Phosphorus (P) mg/L 0.211(1) 7104618 0.208(1) 0.0116(1) 0.0020 0.0065(1) 0.0020 7104618Total Total Kjeldahl Nitrogen (Calc) mg/L <0.10 7098135 0.20 <0.10 0.10 <0.20 0.20 7098135Nitrate plus Nitrite (N) mg/L 3.88(1) 7107191 3.89(1) 3.93(1) 0.10 3.82(1) 0.10 7107191Total Nitrogen (N) mg/L 3.82 7107338 4.10 3.84 0.10 3.75(2) 0.20 7107338Total Phosphorus (P) mg/L 0.208 7110553 0.211 0.0164 0.0020 0.0199 0.0020 7110553OIL & GREASETotal Oil and grease mg/L 16 1.0 <1.0 1.0 7107639Physical PropertiesConductivity uS/cm 539 7106156 539 546 1.0 545 1.0 7106156pH pH Units 7.83 7106158 7.86 7.73 7.72 7106158

N/A = Not ApplicableRDL = Reportable Detection Limit(1) - Sample arrived to laboratory past recommended hold time.(2) - RDL raised due to sample matrix interference.

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UNITS 1645-13-4 QC Batch 1645-13-5 1645-18 RDL 1645-18B RDL QC BatchPhysical PropertiesTotal Dissolved Solids mg/L 302 7099224 304 300 10 326 10 7099224

RDL = Reportable Detection Limit

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LOW LEVEL DISSOLVED METALS IN WATER (WATER)


UNITS 1645-13-4 1645-13-5 1645-18 QC Batch 1645-18B RDL QC BatchMisc. InorganicsDissolved Hardness (CaCO3) mg/L 112 109 114 7098783 108 0.50 7098783


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LOW LEVEL DISSOLVED METALS IN WATER (WATER)


UNITS 1645-13-4 1645-13-5 1645-18 QC Batch 1645-18B RDL QC BatchDissolved Metals by ICPMSDissolved Aluminum (Al) ug/L 85.6 89.4 85.4 7115400 102 0.50 7115400Dissolved Antimony (Sb) ug/L 0.657 0.654 0.652 7115400 0.620 0.020 7115400Dissolved Arsenic (As) ug/L 4.85 4.75 1.17 7115400 1.28 0.020 7115400Dissolved Barium (Ba) ug/L 58.8 60.4 62.9 7115400 58.0 0.020 7115400Dissolved Beryllium (Be) ug/L <0.010 <0.010 <0.010 7115400 <0.010 0.010 7115400Dissolved Bismuth (Bi) ug/L <0.0050 <0.0050 <0.0050 7115400 <0.0050 0.0050 7115400Dissolved Boron (B) ug/L 27.2 28.0 29.1 7115400 27.7 5.0 7115400Dissolved Cadmium (Cd) ug/L 0.0170 0.0200 0.0200 7123146 0.0180 0.0050 7123146Dissolved Chromium (Cr) ug/L 0.52 0.43 0.47 7115400 0.31 0.10 7115400Dissolved Cobalt (Co) ug/L 0.189 0.193 0.204 7115400 0.214 0.0050 7115400Dissolved Copper (Cu) ug/L 0.447 0.566 0.459 7115400 0.452(1) 0.050 7115400Dissolved Iron (Fe) ug/L 7.5 7.4 1.9 7115400 2.3 1.0 7115400Dissolved Lead (Pb) ug/L 0.0120 0.0160 0.0070 7115400 0.0060 0.0050 7115400Dissolved Lithium (Li) ug/L 14.3 16.6 15.4 7115400 14.5 0.50 7115400Dissolved Manganese (Mn) ug/L 1.02 1.24 7.29 7115400 11.6 0.050 7115400Dissolved Mercury (Hg) ug/L <0.010 <0.010 <0.010 7115400 <0.010 0.010 7115400Dissolved Molybdenum (Mo) ug/L 43.2 42.6 43.8 7115400 41.6 0.050 7115400Dissolved Nickel (Ni) ug/L 4.24 4.29 4.39 7115400 4.48 0.020 7115400Dissolved Selenium (Se) ug/L 0.169 0.157 0.138 7115400 0.126 0.040 7115400Dissolved Silicon (Si) ug/L 4740 4920 3860 7123146 4110 100 7123146Dissolved Silver (Ag) ug/L 0.0080 0.0100 0.0060 7115400 0.0080 0.0050 7115400Dissolved Strontium (Sr) ug/L 534 537 561 7115400 521 0.050 7115400Dissolved Thallium (Tl) ug/L 0.0110 0.0080 0.0090 7115400 0.0080 0.0020 7115400Dissolved Tin (Sn) ug/L <0.20 <0.20 <0.20 7115400 <0.20 0.20 7115400Dissolved Titanium (Ti) ug/L <0.50 <0.50 <0.50 7115400 <0.50 0.50 7115400Dissolved Uranium (U) ug/L 4.80 4.92 2.43 7115400 1.54 0.0020 7115400Dissolved Vanadium (V) ug/L 1.28 1.36 1.16 7115400 1.04 0.20 7115400Dissolved Zinc (Zn) ug/L 0.30 1.24 0.33 7115400 0.22 0.10 7123146Dissolved Zirconium (Zr) ug/L <0.10 <0.10 <0.10 7115400 <0.10 0.10 7115400Dissolved Calcium (Ca) mg/L 26.4 25.8 27.3 7099375 25.3 0.010 7099375Dissolved Magnesium (Mg) mg/L 11.1 10.8 11.1 7099375 10.8 0.010 7099375Dissolved Potassium (K) mg/L 17.7 17.6 18.0 7099375 17.3 0.010 7099375Dissolved Sodium (Na) mg/L 40.1 39.6 41.1 7099375 39.6 0.010 7099375Dissolved Sulphur (S) mg/L 26.6 23.9 28.1 7099375 29.7 0.60 7099375

RDL = Reportable Detection Limit(1) - Dissolved greater than total. Reanalysis yields similar results.

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LOW LEVEL TOTAL METALS IN WATER (WATER)


UNITS 1645-13-4 1645-13-5 1645-18 1645-18B RDL QC BatchCalculated ParametersTotal Hardness (CaCO3) mg/L 106 111 108 110 0.50 7098337


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UNITS 1645-13-4 1645-13-5 1645-18 1645-18B RDL QC BatchTotal Metals by ICPMSTotal Aluminum (Al) ug/L 120 127 154 204 0.50 7105290Total Antimony (Sb) ug/L 0.599 0.621 0.657 0.635 0.020 7105290Total Arsenic (As) ug/L 4.74 4.82 1.18 1.39 0.020 7105290Total Barium (Ba) ug/L 63.2 61.9 63.6 61.5 0.020 7105290Total Beryllium (Be) ug/L <0.010 <0.010 <0.010 <0.010 0.010 7105290Total Bismuth (Bi) ug/L 0.0050 0.0050 <0.0050 <0.0050 0.0050 7105290Total Boron (B) ug/L 28.8 35.1 31.9 31.6 5.0 7105290Total Cadmium (Cd) ug/L 0.0100 0.0110 0.0390 0.0060 0.0050 7105290Total Chromium (Cr) ug/L 13.2 3.43 9.29 4.02 0.10 7105290Total Cobalt (Co) ug/L 0.400 0.308 0.324 0.262 0.0050 7105290Total Copper (Cu) ug/L 0.619 0.630 0.488 0.350 0.050 7105290Total Iron (Fe) ug/L 49.4 48.6 4.5 9.6 1.0 7105290Total Lead (Pb) ug/L 0.0690 0.0780 0.0080 0.0100 0.0050 7105290Total Lithium (Li) ug/L 15.3 15.3 15.3 15.9 0.50 7105290Total Manganese (Mn) ug/L 13.5 12.7 9.63 13.3 0.050 7105290Total Mercury (Hg) ug/L <0.010 <0.010 <0.010 <0.010 0.010 7105290Total Molybdenum (Mo) ug/L 62.0 47.6 58.8 49.0 0.050 7105290Total Nickel (Ni) ug/L 90.3 23.6 63.4 29.8 0.020 7105290Total Selenium (Se) ug/L 0.159 0.169 0.139 0.102 0.040 7105290Total Silicon (Si) ug/L 3980 4000 3300 3380 100 7105290Total Silver (Ag) ug/L 0.0060 <0.0050 <0.0050 <0.0050 0.0050 7105290Total Strontium (Sr) ug/L 545 549 564 553 0.050 7105290Total Thallium (Tl) ug/L 0.0110 0.0090 0.0100 0.0080 0.0020 7105290Total Tin (Sn) ug/L <0.20 <0.20 <0.20 <0.20 0.20 7105290Total Titanium (Ti) ug/L 0.88 <0.50 <0.50 <0.50 0.50 7105290Total Uranium (U) ug/L 5.27 5.31 2.74 1.87 0.0020 7105290Total Vanadium (V) ug/L 1.26 1.23 1.09 0.99 0.20 7105290Total Zinc (Zn) ug/L 0.86 1.42 0.17 0.26 0.10 7105290Total Zirconium (Zr) ug/L <0.10 <0.10 <0.10 <0.10 0.10 7105290Total Calcium (Ca) mg/L 23.4 24.6 23.5 24.3 0.010 7099339Total Magnesium (Mg) mg/L 11.6 12.0 12.0 12.0 0.010 7099339Total Potassium (K) mg/L 17.8 18.6 19.0 18.3 0.010 7099339Total Sodium (Na) mg/L 42.5 43.7 45.2 43.9 0.010 7099339Total Sulphur (S) mg/L 22.2 22.9 28.6 28.4 0.60 7099339


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Package 1 8.7°CPackage 2 4.3°CPackage 3 3.7°C

Each temperature is the average of up to three cooler temperatures taken at receipt

General Comments

Sample HG6772-01: The BC-MOE and APHA Standard Method require pH to be analysed within 15 minutes of sampling and therefore field analysis is required for compliance. All LaboratorypH analyses in this report are reported past the BC-MOE/APHA Standard Method holding time.




Sample HG6772, Elements by ICPMS Low Level (dissolved): Test repeated.Sample HG6773, Elements by ICPMS Low Level (dissolved): Test repeated.Sample HG6774, Elements by ICPMS Low Level (dissolved): Test repeated.Sample HG6775, Elements by ICPMS Low Level (dissolved): Test repeated.

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QUALITY ASSURANCE REPORT

Matrix Spike Spiked Blank Method Blank RPDQC Batch Parameter Date % Recovery QC Limits % Recovery QC Limits Value UNITS Value (%) QC Limits7099224 Total Dissolved Solids 2013/08/22 NC 80 - 120 98 80 - 120 <10 mg/L 1.3 207099709 Acidity (pH 8.3) 2013/08/21 108 80 - 120 <0.50 mg/L NC 207099709 Acidity (pH 4.5) 2013/08/21 <0.50 mg/L NC 207103881 Total Organic Carbon (C) 2013/08/22 107 80 - 120 107 80 - 120 <0.50 mg/L NC 207103884 Dissolved Organic Carbon (C) 2013/08/22 97 80 - 120 106 80 - 120 <0.50 mg/L NC 207104092 Ammonia (N) 2013/08/22 99 80 - 120 103 80 - 120 <0.0050 mg/L NC 207104501 Fluoride (F) 2013/08/22 NC 80 - 120 100 80 - 120 <0.010 mg/L 0 207104618 Dissolved Phosphorus (P) 2013/08/22 91 80 - 120 98 80 - 120 <0.0020 mg/L NC 207105290 Total Aluminum (Al) 2013/08/24 NC 80 - 120 102 80 - 120 <0.50 ug/L 1.5 207105290 Total Antimony (Sb) 2013/08/24 NC 80 - 120 105 80 - 120 <0.020 ug/L 5.8 207105290 Total Arsenic (As) 2013/08/24 105 80 - 120 103 80 - 120 <0.020 ug/L 1.1 207105290 Total Barium (Ba) 2013/08/24 NC 80 - 120 100 80 - 120 <0.020 ug/L 0.5 207105290 Total Beryllium (Be) 2013/08/24 98 80 - 120 102 80 - 120 <0.010 ug/L NC 207105290 Total Bismuth (Bi) 2013/08/24 95 80 - 120 108 80 - 120 <0.0050 ug/L NC 207105290 Total Cadmium (Cd) 2013/08/24 99 80 - 120 102 80 - 120 <0.0050 ug/L NC 207105290 Total Chromium (Cr) 2013/08/24 NC 80 - 120 106 80 - 120 <0.10 ug/L 6.9 207105290 Total Cobalt (Co) 2013/08/24 98 80 - 120 104 80 - 120 <0.0050 ug/L 5.6 207105290 Total Copper (Cu) 2013/08/24 94 80 - 120 104 80 - 120 <0.050 ug/L 1.6 207105290 Total Iron (Fe) 2013/08/24 98 80 - 120 105 80 - 120 <1.0 ug/L 2.3 207105290 Total Lead (Pb) 2013/08/24 98 80 - 120 104 80 - 120 <0.0050 ug/L 1.4 207105290 Total Lithium (Li) 2013/08/24 NC 80 - 120 96 80 - 120 <0.50 ug/L 4.2 207105290 Total Manganese (Mn) 2013/08/24 NC 80 - 120 105 80 - 120 <0.050 ug/L 5.4 207105290 Total Mercury (Hg) 2013/08/24 97 80 - 120 105 80 - 120 <0.010 ug/L NC 207105290 Total Molybdenum (Mo) 2013/08/24 NC 80 - 120 105 80 - 120 <0.050 ug/L 3.2 207105290 Total Nickel (Ni) 2013/08/24 NC 80 - 120 108 80 - 120 <0.020 ug/L 3.9 207105290 Total Selenium (Se) 2013/08/24 108 80 - 120 109 80 - 120 <0.040 ug/L NC (1) 207105290 Total Silver (Ag) 2013/08/24 103 80 - 120 84 80 - 120 0.0080, RDL=0.0050 ug/L NC 207105290 Total Strontium (Sr) 2013/08/24 NC 80 - 120 97 80 - 120 <0.050 ug/L 2.3 207105290 Total Thallium (Tl) 2013/08/24 97 80 - 120 107 80 - 120 0.0030, RDL=0.0020 ug/L 0 207105290 Total Tin (Sn) 2013/08/24 97 80 - 120 99 80 - 120 <0.20 ug/L NC 207105290 Total Titanium (Ti) 2013/08/24 110 80 - 120 99 80 - 120 <0.50 ug/L NC 207105290 Total Uranium (U) 2013/08/24 NC 80 - 120 105 80 - 120 <0.0020 ug/L 1.6 207105290 Total Vanadium (V) 2013/08/24 94 80 - 120 102 80 - 120 <0.20 ug/L 10.3 207105290 Total Zinc (Zn) 2013/08/24 101 80 - 120 111 80 - 120 <0.10 ug/L 24.2(2, 1) 207105290 Total Boron (B) 2013/08/24 <50 ug/L 5.8 207105290 Total Silicon (Si) 2013/08/24 <100 ug/L 1.7 207105290 Total Zirconium (Zr) 2013/08/24 <0.10 ug/L NC 207106012 Alkalinity (Total as CaCO3) 2013/08/23 NC 80 - 120 101 80 - 120 <0.50 mg/L 9.5 207106012 Alkalinity (PP as CaCO3) 2013/08/23 <0.50 mg/L NC 20

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Matrix Spike Spiked Blank Method Blank RPDQC Batch Parameter Date % Recovery QC Limits % Recovery QC Limits Value UNITS Value (%) QC Limits7106012 Bicarbonate (HCO3) 2013/08/23 <0.50 mg/L 9.5 207106012 Carbonate (CO3) 2013/08/23 <0.50 mg/L NC 207106012 Hydroxide (OH) 2013/08/23 <0.50 mg/L7106156 Conductivity 2013/08/22 99 80 - 120 1.2, RDL=1.0 uS/cm 0.5 207106630 Orthophosphate (P) 2013/08/22 NC 80 - 120 92 80 - 120 <0.0050 mg/L 0.9 207107191 Nitrate plus Nitrite (N) 2013/08/22 104 80 - 120 104 80 - 120 <0.020 mg/L 0.3 257107193 Nitrite (N) 2013/08/22 103 80 - 120 101 80 - 120 <0.0050 mg/L 0.2 207107338 Total Nitrogen (N) 2013/08/23 NC 80 - 120 98 80 - 120 <0.020 mg/L 0.4 207107639 Total Oil and grease 2013/08/27 89 70 - 130 <1.0 mg/L7108789 Dissolved Chloride (Cl) 2013/08/22 94 80 - 120 99 80 - 120 <0.50 mg/L 1.7 207108894 Dissolved Sulphate (SO4) 2013/08/22 NC 80 - 120 100 80 - 120 <0.50 mg/L 0.9 207110553 Total Phosphorus (P) 2013/08/23 96 80 - 120 99 80 - 120 <0.0020 mg/L NC 207111863 Dissolved Sulphate (SO4) 2013/08/23 NC 80 - 120 97 80 - 120 0.88, RDL=0.50 mg/L 0.09 207115400 Dissolved Aluminum (Al) 2013/08/26 NC 80 - 120 102 80 - 120 <0.50 ug/L 1.9 207115400 Dissolved Antimony (Sb) 2013/08/26 99 80 - 120 98 80 - 120 <0.020 ug/L 4.4 207115400 Dissolved Arsenic (As) 2013/08/26 99 80 - 120 97 80 - 120 <0.020 ug/L 6.1 207115400 Dissolved Barium (Ba) 2013/08/26 NC 80 - 120 97 80 - 120 <0.020 ug/L 3.7 207115400 Dissolved Beryllium (Be) 2013/08/26 99 80 - 120 93 80 - 120 <0.010 ug/L 12.4 207115400 Dissolved Bismuth (Bi) 2013/08/26 105 80 - 120 97 80 - 120 <0.0050 ug/L NC 207115400 Dissolved Chromium (Cr) 2013/08/26 99 80 - 120 97 80 - 120 <0.10 ug/L NC 207115400 Dissolved Cobalt (Co) 2013/08/26 NC 80 - 120 97 80 - 120 <0.0050 ug/L 1.4 207115400 Dissolved Copper (Cu) 2013/08/26 NC 80 - 120 96 80 - 120 <0.050 ug/L 2.8 207115400 Dissolved Iron (Fe) 2013/08/26 NC 80 - 120 111 80 - 120 <1.0 ug/L 3.7 207115400 Dissolved Lead (Pb) 2013/08/26 100 80 - 120 99 80 - 120 <0.0050 ug/L 1.9 207115400 Dissolved Lithium (Li) 2013/08/26 103 80 - 120 97 80 - 120 <0.50 ug/L 7.9 207115400 Dissolved Manganese (Mn) 2013/08/26 NC 80 - 120 99 80 - 120 <0.050 ug/L 2.7 207115400 Dissolved Mercury (Hg) 2013/08/26 100 80 - 120 97 80 - 120 <0.010 ug/L NC 207115400 Dissolved Molybdenum (Mo) 2013/08/26 89 80 - 120 89 80 - 120 <0.050 ug/L NC 207115400 Dissolved Nickel (Ni) 2013/08/26 98 80 - 120 99 80 - 120 <0.020 ug/L 7.0 207115400 Dissolved Selenium (Se) 2013/08/26 102 80 - 120 103 80 - 120 <0.040 ug/L NC 207115400 Dissolved Silver (Ag) 2013/08/26 106 80 - 120 86 80 - 120 <0.0050 ug/L 4.0 207115400 Dissolved Strontium (Sr) 2013/08/26 NC 80 - 120 97 80 - 120 <0.050 ug/L 2.3 207115400 Dissolved Thallium (Tl) 2013/08/26 NC 80 - 120 104 80 - 120 0.0020, RDL=0.0020 ug/L 2.7 207115400 Dissolved Tin (Sn) 2013/08/26 99 80 - 120 95 80 - 120 <0.20 ug/L NC 207115400 Dissolved Titanium (Ti) 2013/08/26 103 80 - 120 98 80 - 120 <0.50 ug/L NC 207115400 Dissolved Uranium (U) 2013/08/26 93 80 - 120 90 80 - 120 <0.0020 ug/L 1.7 207115400 Dissolved Vanadium (V) 2013/08/26 98 80 - 120 95 80 - 120 <0.20 ug/L NC 207115400 Dissolved Zinc (Zn) 2013/08/26 NC 80 - 120 95 80 - 120 <0.10 ug/L 4.5 207115400 Dissolved Boron (B) 2013/08/26 <50 ug/L NC 20

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Matrix Spike Spiked Blank Method Blank RPDQC Batch Parameter Date % Recovery QC Limits % Recovery QC Limits Value UNITS Value (%) QC Limits7115400 Dissolved Zirconium (Zr) 2013/08/26 <0.10 ug/L NC 207123146 Dissolved Cadmium (Cd) 2013/08/28 102 80 - 120 94 80 - 120 <0.0050 ug/L7123146 Dissolved Zinc (Zn) 2013/08/28 103 80 - 120 99 80 - 120 <0.10 ug/L7123146 Dissolved Silicon (Si) 2013/08/28 <100 ug/L

N/A = Not ApplicableRDL = Reportable Detection LimitRPD = Relative Percent DifferenceDuplicate: Paired analysis of a separate portion of the same sample. Used to evaluate the variance in the measurement.Matrix Spike: A sample to which a known amount of the analyte of interest has been added. Used to evaluate sample matrix interference.Spiked Blank: A blank matrix sample to which a known amount of the analyte, usually from a second source, has been added. Used to evaluate method accuracy.Method Blank: A blank matrix containing all reagents used in the analytical procedure. Used to identify laboratory contamination.NC (Matrix Spike): The recovery in the matrix spike was not calculated. The relative difference between the concentration in the parent sample and the spiked amount was not sufficiently significantto permit a reliable recovery calculation.NC (RPD): The RPD was not calculated. The level of analyte detected in the parent sample and its duplicate was not sufficiently significant to permit a reliable calculation.(1) - Duplicate RPD above control limit - (10% of analytes failure allowed).(2) - Recovery or RPD for this parameter is outside control limits. The overall quality control for this analysis meets acceptability criteria.

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Validation Signature Page

Maxxam Job #: B373986

The analytical data and all QC contained in this report were reviewed and validated by the following individual(s).

Andy Lu, Data Validation Coordinator

====================================================================Maxxam has procedures in place to guard against improper use of the electronic signature and have the required "signatories", as per section 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. For Service Group specific validation please refer to the Validation Signature Page.

Page 13 of 14

Your Project #: SNP/NI SLUDGE PO # K00909Your C.O.C. #: 08344508

Attention: DDMI EnvironmentDIAVIK DIAMOND MINES INC.P.O. BOX 24985007 - 50 AVE.YELLOWKNIFE, NTCANADA X1A 2P8

Report Date: 2013/08/28

CERTIFICATE OF ANALYSIS

MAXXAM JOB #: B374017Received: 2013/08/21, 09:40

Sample Matrix: Water# Samples Received: 10

Date DateAnalyses Quantity Extracted Analyzed Laboratory Method Analytical MethodAcidity pH 4.5 & pH 8.3 (as CaCO3) 3 N/A 2013/08/22 BBY6SOP-00037 S M - 2 3 1 0 B Alkalinity - Water 3 2013/08/22 2013/08/22 BBY6SOP-00026 S M 2 3 2 0 B Biochemical Oxygen Demand ( 1 ) 2 2013/08/20 2013/08/25 AB SOP-00017 SM 5210 B BTEX/MTBE LH, VH, F1 SIM/MS 5 2013/08/22 2013/08/22 BBY8-SOP-00010 EPA 8260C Chloride by Automated Colourimetry 3 N/A 2013/08/22 BBY6SOP-00011 S M - 4 5 0 0 - C l - Fecal Coliforms (MF) ( 1 ) 2 2013/08/20 2013/08/21 EENVSOP-00157 S M 9 2 2 2 D Conductance - water 3 N/A 2013/08/22 BBY6SOP-00026 S M - 2 5 1 0 B CCME Hydrocarbons (F2-F4 in water) 3 2013/08/23 2013/08/23 BBY8SOP-00030 CCME Soil Tier1 CCME Hydrocarbons (F2-F4 in water) 2 2013/08/23 2013/08/26 BBY8SOP-00030 CCME Soil Tier1 Fluoride - Mining Clients 3 N/A 2013/08/22 BBY6SOP-00038 SM - 4500 F C Hardness Total (calculated as CaCO3) 3 N/A 2013/08/25 BBY7SOP-00002 EPA 6020A Na, K, Ca, Mg, S by CRC ICPMS (total) 3 N/A 2013/08/25 BBY7SOP-00002 EPA 6020A Elements by ICPMS Low Level (total) 3 N/A 2013/08/24 BBY7SOP-00002 EPA 6020A Nitrogen (Total) 2 2013/08/22 2013/08/23 BBY6SOP-00022 SM-4500N C Nitrogen (Total) 1 2013/08/26 2013/08/27 BBY6SOP-00022 SM-4500N C Ammonia-N (Preserved) 2 N/A 2013/08/22 BBY6SOP-00009 S M - 4 5 0 0 N H 3 G Ammonia-N (Preserved) 1 N/A 2013/08/26 BBY6SOP-00009 S M - 4 5 0 0 N H 3 G Nitrate + Nitrite (N) 2 N/A 2013/08/22 BBY6SOP-00010 SM 4500NO3-I Nitrate + Nitrite (N) 1 N/A 2013/08/27 BBY6SOP-00010 SM 4500NO3-I Nitrite (N) by CFA 2 N/A 2013/08/22 BBY6SOP-00010 EPA 353.2 Nitrite (N) by CFA 1 N/A 2013/08/27 BBY6SOP-00010 EPA 353.2 Nitrogen - Nitrate (as N) 2 N/A 2013/08/23 BBY6SOP-00010 SM 4500NO3-I Nitrogen - Nitrate (as N) 1 N/A 2013/08/28 BBY6SOP-00010 SM 4500NO3-I PAH in Water by GC/MS (SIM) 3 2013/08/23 2013/08/23 BBY8SOP-00021 EPA 8270D PAH in Water by GC/MS (SIM) 1 2013/08/23 2013/08/24 BBY8SOP-00021 EPA 8270D PAH in Water by GC/MS (SIM) 1 2013/08/23 2013/08/26 BBY8SOP-00021 EPA 8270D Total LMW, HMW, Total PAH Calc 4 N/A 2013/08/24 BBY WI-00033 BC MOE Lab Method Total LMW, HMW, Total PAH Calc 1 N/A 2013/08/27 BBY WI-00033 BC MOE Lab Method pH Water 3 N/A 2013/08/22 BBY6SOP-00026 S M - 4 5 0 0 H + B Orthophosphate by Konelab 3 N/A 2013/08/22 BBY6SOP-00013 SM 4500 P E Sulphate by Automated Colourimetry 3 N/A 2013/08/22 BBY6SOP-00017 SM4500-SO42- E Total Dissolved Solids (Filt. Residue) 3 2013/08/26 2013/08/27 BBY6SOP-00033 SM 2540C Hydrocarbons (C10-C30) in Water - GC/FID 2 2013/08/22 2013/08/22 BBY8SOP-00029 BC Env. Lab Manual TKN (Calc. TN, N/N) total 3 N/A 2013/08/23 BBY6SOP-00022 SM 4500N-C Total Oil and Grease 2 N/A 2013/08/27 BBY8SOP-00004 BC Lab Manual Phosphorus-P (LL Tot, dissolved) - UF/UP 3 2013/08/22 2013/08/22 BBY6SOP-00013 SM-4500 PE Total Phosphorus 3 N/A 2013/08/23 BBY6SOP-00013 SM 4500 P E Volatile F1-BTEX 5 N/A 2013/08/23 BBY WI-00033 BC MOE Lab Method

* Results relate only to the items tested.

Page 1 of 23

(1) This test was performed by Maxxam Edmonton Environmental

Encryption Key

Please direct all questions regarding this Certificate of Analysis to your Project Manager.

Tabitha Rudkin, Burnaby Project ManagerEmail: [email protected]# (604) 638-2639

====================================================================This report has been generated and distributed using a secure automated process.Maxxam has procedures in place to guard against improper use of the electronic signature and have the required "signatories", as per section5.10.2 of ISO/IEC 17025:2005(E), signing the reports. For Service Group specific validation please refer to the Validation Signature Page.

Total cover pages: 1


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DIAVIK DIAMOND MINES INC.Maxxam Job #: B374017 Client Project #: SNP/NI SLUDGEReport Date: 2013/08/28


Maxxam ID HG6915 HG6916 HG6917 HG6918 HG6919Sampling Date 2013/08/18 2013/08/18 2013/08/18 2013/08/19 2013/08/19

UNITS 1645-18 RDL QC Batch 1645-18-2 RDL 1645-18B 1645-18 1645-18B RDL QC BatchMisc. InorganicsAcidity (pH 4.5) mg/L <0.50 0.50 7105735 <0.50 0.50 <0.50 0.50 7105735Acidity (pH 8.3) mg/L <0.50 0.50 7105735 0.88 0.50 0.92 0.50 7105735Fluoride (F) mg/L 0.120 0.010 7104501 <0.010 0.010 0.110 0.010 7104501ANIONSNitrite (N) mg/L 0.100 0.0050 7121668 <0.0050(1) 0.0050 0.0984(1) 0.0050 7107193Calculated ParametersNitrate (N) mg/L 3.13 0.10 7115389 <0.020 0.020 3.57 0.040 7099714Demand ParametersBiochemical Oxygen Demand mg/L <2.0 <2.0 2.0 7096064Misc. InorganicsAlkalinity (Total as CaCO3) mg/L 42.1 0.50 7106012 0.83 0.50 41.7 0.50 7106012Alkalinity (PP as CaCO3) mg/L <0.50 0.50 7106012 <0.50 0.50 <0.50 0.50 7106012Bicarbonate (HCO3) mg/L 51.4 0.50 7106012 1.01 0.50 50.8 0.50 7106012Carbonate (CO3) mg/L <0.50 0.50 7106012 <0.50 0.50 <0.50 0.50 7106012Hydroxide (OH) mg/L <0.50 0.50 7106012 <0.50 0.50 <0.50 0.50 7106012AnionsDissolved Sulphate (SO4) mg/L 81.0 0.50 7108894 <0.50 0.50 82.1 0.50 7108894Dissolved Chloride (Cl) mg/L 71 0.50 7108789 0.74 0.50 71 0.50 7108789Microbiological Param.Fecal Coliforms CFU/100mL <1.0 <1.0(2) 1.0 7103243NutrientsAmmonia (N) mg/L 0.097 0.0050 7117277 0.024 0.0050 0.17 0.0050 7104092Orthophosphate (P) mg/L 0.0117(1) 0.0050 7106630 <0.0050(1) 0.0050 0.0082(1) 0.0050 7106630Dissolved Phosphorus (P) mg/L 0.0115 0.0020 7104618 <0.0020 0.0020 0.0082 0.0020 7104618Total Total Kjeldahl Nitrogen (Calc) mg/L 0.62 0.10 7098135 0.028 0.020 <0.20 0.20 7098135Nitrate plus Nitrite (N) mg/L 3.23(3) 0.10 7121657 <0.020(1) 0.020 3.67(1) 0.040 7107191Total Nitrogen (N) mg/L 3.84 0.10 7121672 0.028 0.020 3.69(4) 0.20 7107338Total Phosphorus (P) mg/L 0.0194 0.0020 7110553 <0.0020 0.0020 0.0426 0.0020 7110553OIL & GREASETotal Oil and grease mg/L <1.0 <1.0 1.0 7107639

RDL = Reportable Detection Limit(1) - Sample analysed past recommended hold time.(2) - Sample received past method-specified hold time.(3) - Sample was originally analysed within hold time. Data quality required investigation. Re-analysis was completed past recommended hold time.(4) - RDL raised due to sample matrix interference.

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UNITS 1645-18 RDL QC Batch 1645-18-2 RDL 1645-18B 1645-18 1645-18B RDL QC BatchPhysical PropertiesConductivity uS/cm 525 1.0 7106156 1.9 1.0 527 1.0 7106156pH pH Units 7.64 7106158 6.26 7.60 7106158Physical PropertiesTotal Dissolved Solids mg/L 318(1) 10 7116413 <10(1) 10 314(1) 10 7116413

PETROLEUM HYDROCARBONS (CCME)


UNITS 1645-16 1645-75 1645-75B 1645-13 NI SLUDGE RDL QC BatchExtractable HydrocarbonsF2 (C10-C16 Hydrocarbons) mg/L <0.20 <0.20 <0.20 <0.20 <0.20 0.20 7108496F3 (C16-C34 Hydrocarbons) mg/L <0.20 1.7 <0.20 <0.20 0.51 0.20 7108496F4 (C34-C50 Hydrocarbons) mg/L <3.0 <3.0 <3.0 <3.0 <3.0 3.0 7108496Reached Baseline at C50 mg/L YES YES YES YES YES N/A 7108496Surrogate Recovery (%)O-TERPHENYL (sur.) % 101 101 98 103 126 7108496

TOTAL PETROLEUM HYDROCARBONS (WATER)

Maxxam ID HG6918 HG6919Sampling Date 2013/08/19 2013/08/19

UNITS 1645-18 1645-18B RDL QC BatchHydrocarbonsTotal Extractables C10 to C30 mg/L <0.20 <0.20 0.20 7103717Surrogate Recovery (%)O-TERPHENYL (sur.) % 93 93 7103717

N/A = Not ApplicableRDL = Reportable Detection Limit(1) - Sample analysed past recommended hold time.

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CCME BTEX/F1 IN WATER (WATER)


UNITS 1645-16 1645-75 1645-75B 1645-13 NI SLUDGE RDL QC Batch

Calculated ParametersF1 (C6-C10) - BTEX ug/L <300 <300 <300 <300 <300 300 7101580VolatilesMethyl-tert-butylether (MTBE) ug/L <4.0 <4.0 <4.0 <4.0 <4.0 4.0 7104245Benzene ug/L <0.40 <0.40 <0.40 <0.40 <0.40 0.40 7104245Toluene ug/L <0.40 <0.40 <0.40 <0.40 <0.40 0.40 7104245Ethylbenzene ug/L <0.40 <0.40 <0.40 <0.40 <0.40 0.40 7104245m & p-Xylene ug/L <0.40 <0.40 <0.40 <0.40 <0.40 0.40 7104245o-Xylene ug/L <0.40 <0.40 <0.40 <0.40 <0.40 0.40 7104245Styrene ug/L <0.40 <0.40 <0.40 <0.40 <0.40 0.40 7104245Xylenes (Total) ug/L <0.40 <0.40 <0.40 <0.40 <0.40 0.40 7104245(C6-C10) ug/L <300 <300 <300 <300 <300 300 7104245Surrogate Recovery (%)1,4-Difluorobenzene (sur.) % 98 98 98 98 98 71042454-BROMOFLUOROBENZENE (sur.) % 104 106 107 106 105 7104245D4-1,2-DICHLOROETHANE (sur.) % 90 91 91 92 92 7104245


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Maxxam ID HG6915 HG6916 HG6917Sampling Date 2013/08/18 2013/08/18 2013/08/18

UNITS 1645-18 1645-18-2 1645-18B RDL QC BatchCalculated ParametersTotal Hardness (CaCO3) mg/L 110 <0.50 103 0.50 7098337Total Metals by ICPMSTotal Aluminum (Al) ug/L 129 2.18 262 0.50 7105290Total Antimony (Sb) ug/L 0.562 <0.020 0.614 0.020 7105290Total Arsenic (As) ug/L 1.28 <0.020 1.35 0.020 7105290Total Barium (Ba) ug/L 61.7 0.050 61.2 0.020 7105290Total Beryllium (Be) ug/L <0.010 <0.010 <0.010 0.010 7105290Total Bismuth (Bi) ug/L <0.0050 <0.0050 <0.0050 0.0050 7105290Total Boron (B) ug/L 27.3 <5.0 29.5 5.0 7105290Total Cadmium (Cd) ug/L 0.0060 <0.0050 <0.0050 0.0050 7105290Total Chromium (Cr) ug/L 0.46 <0.10 0.42 0.10 7105290Total Cobalt (Co) ug/L 0.220 <0.0050 0.227 0.0050 7105290Total Copper (Cu) ug/L 0.525 0.080 0.308 0.050 7105290Total Iron (Fe) ug/L 4.1 1.0 5.9 1.0 7105290Total Lead (Pb) ug/L 0.0180 0.0120 0.0120 0.0050 7105290Total Lithium (Li) ug/L 15.8 <0.50 15.1 0.50 7105290Total Manganese (Mn) ug/L 11.6 <0.050 13.1 0.050 7105290Total Mercury (Hg) ug/L <0.010 <0.010 <0.010 0.010 7105290Total Molybdenum (Mo) ug/L 40.9 <0.050 41.4 0.050 7105290Total Nickel (Ni) ug/L 5.13 0.035 4.95 0.020 7105290Total Selenium (Se) ug/L 0.143 <0.040 0.115 0.040 7105290Total Silicon (Si) ug/L 3500 <100 3340 100 7105290Total Silver (Ag) ug/L <0.0050 <0.0050 <0.0050 0.0050 7105290Total Strontium (Sr) ug/L 539 0.135 546 0.050 7105290Total Thallium (Tl) ug/L 0.0090 0.0020 0.0080 0.0020 7105290Total Tin (Sn) ug/L <0.20 <0.20 <0.20 0.20 7105290Total Titanium (Ti) ug/L <0.50 <0.50 <0.50 0.50 7105290Total Uranium (U) ug/L 2.60 <0.0020 2.19 0.0020 7105290Total Vanadium (V) ug/L 1.09 <0.20 0.89 0.20 7105290Total Zinc (Zn) ug/L 1.32 1.77 1.13 0.10 7105290Total Zirconium (Zr) ug/L <0.10 <0.10 <0.10 0.10 7105290Total Calcium (Ca) mg/L 23.2 0.015 22.7 0.010 7099339Total Magnesium (Mg) mg/L 12.6 <0.010 11.2 0.010 7099339Total Potassium (K) mg/L 19.8 0.026 18.3 0.010 7099339Total Sodium (Na) mg/L 46.9 0.120 42.7 0.010 7099339Total Sulphur (S) mg/L 28.9 <0.60 27.8 0.60 7099339


Page 6 of 23


CCME PAH IN WATER BY GC-MS (WATER)


UNITS 1645-16 1645-75 1645-75B 1645-13 RDL NI SLUDGE RDL QC Batch

Polycyclic AromaticsLow Molecular Weight PAH`s ug/L <0.50 <0.50 <0.50 <0.50 0.50 <0.50 0.50 7098998High Molecular Weight PAH`s ug/L <0.050 <0.050 <0.050 <0.050 0.050 0.17 0.090 7098998Total PAH ug/L <0.50 <0.50 <0.50 <0.50 0.50 <0.50 0.50 7098998Naphthalene ug/L <0.10 0.14 <0.10 <0.10 0.10 <0.10 0.10 71085552-Methylnaphthalene ug/L <0.10 <0.10 <0.10 <0.10 0.10 <0.10 0.10 7108555Quinoline ug/L <0.50 <0.50 <0.50 <0.50 0.50 <0.50 0.50 7108555Acenaphthylene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Acenaphthene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Fluorene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Phenanthrene ug/L <0.050 <0.050 <0.050 <0.050 0.050 0.056 0.050 7108555Anthracene ug/L <0.010 <0.010 <0.010 <0.010 0.010 <0.010 0.010 7108555Acridine ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Fluoranthene ug/L <0.020 <0.020 <0.020 <0.020 0.020 0.035 0.020 7108555Pyrene ug/L <0.020 <0.020 <0.020 <0.020 0.020 0.041 0.020 7108555Benzo(a)anthracene ug/L <0.010 <0.010 <0.010 <0.010 0.010 <0.010 0.010 7108555Chrysene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Benzo(b&j)fluoranthene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Benzo(k)fluoranthene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Benzo(a)pyrene ug/L <0.0090 <0.0090 <0.0090 <0.0090 0.0090 0.097(1) 0.090 7108555Indeno(1,2,3-cd)pyrene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Dibenz(a,h)anthracene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Benzo(g,h,i)perylene ug/L <0.050 <0.050 <0.050 <0.050 0.050 <0.050 0.050 7108555Surrogate Recovery (%)D10-ANTHRACENE (sur.) % 115 91 117 118 107 7108555D8-ACENAPHTHYLENE (sur.) % 104 84 105 108 101 7108555D8-NAPHTHALENE (sur.) % 98 79 96 101 92 7108555D9-Acridine % 84 66 88 89 78 7108555TERPHENYL-D14 (sur.) % 95 85 103 103 44(2) 7108555

RDL = Reportable Detection Limit(1) - RDL raised due to sample dilution.(2) - Surrogate recovery below control limit - Matrix interference - Pot. low bias

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Package 1 3.3°CPackage 2 8.7°C

Each temperature is the average of up to three cooler temperatures taken at receipt

General Comments




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Matrix Spike Spiked Blank Method Blank RPDQC Batch Parameter Date % Recovery QC Limits % Recovery QC Limits Value UNITS Value (%) QC Limits7096064 Biochemical Oxygen Demand 2013/08/25 92 85 - 115 <2.0(1) mg/L NC 207103243 Fecal Coliforms 2013/08/21 <1.0 CFU/100mL NC 207103717 O-TERPHENYL (sur.) 2013/08/22 108 60 - 130 92 60 - 130 93 %7103717 Total Extractables C10 to C30 2013/08/22 NC 50 - 130 110 50 - 130 0.39, RDL=0.20 mg/L NC 407104092 Ammonia (N) 2013/08/22 99 80 - 120 103 80 - 120 <0.0050 mg/L 0.9 207104245 1,4-Difluorobenzene (sur.) 2013/08/22 102 70 - 130 100 70 - 130 97 %7104245 4-BROMOFLUOROBENZENE (sur.) 2013/08/22 95 70 - 130 105 70 - 130 107 %7104245 D4-1,2-DICHLOROETHANE (sur.) 2013/08/22 96 70 - 130 90 70 - 130 91 %7104245 Methyl-tert-butylether (MTBE) 2013/08/22 98 70 - 130 91 70 - 130 <4.0 ug/L7104245 Benzene 2013/08/22 90 70 - 130 81 70 - 130 <0.40 ug/L NC 307104245 Toluene 2013/08/22 90 70 - 130 81 70 - 130 <0.40 ug/L NC 307104245 Ethylbenzene 2013/08/22 88 70 - 130 82 70 - 130 <0.40 ug/L NC 307104245 m & p-Xylene 2013/08/22 89 70 - 130 82 70 - 130 <0.40 ug/L NC 307104245 o-Xylene 2013/08/22 87 70 - 130 82 70 - 130 <0.40 ug/L NC 307104245 Styrene 2013/08/22 88 70 - 130 86 70 - 130 <0.40 ug/L7104245 (C6-C10) 2013/08/22 90 70 - 130 <300 ug/L NC 307104245 Xylenes (Total) 2013/08/22 <0.40 ug/L NC 307104501 Fluoride (F) 2013/08/22 NC 80 - 120 100 80 - 120 <0.010 mg/L NC 207104618 Dissolved Phosphorus (P) 2013/08/22 91 80 - 120 98 80 - 120 <0.0020 mg/L NC 207105290 Total Aluminum (Al) 2013/08/24 NC 80 - 120 102 80 - 120 <0.50 ug/L 1.5 207105290 Total Antimony (Sb) 2013/08/24 NC 80 - 120 105 80 - 120 <0.020 ug/L 5.8 207105290 Total Arsenic (As) 2013/08/24 105 80 - 120 103 80 - 120 <0.020 ug/L 1.1 207105290 Total Barium (Ba) 2013/08/24 NC 80 - 120 100 80 - 120 <0.020 ug/L 0.5 207105290 Total Beryllium (Be) 2013/08/24 98 80 - 120 102 80 - 120 <0.010 ug/L NC 207105290 Total Bismuth (Bi) 2013/08/24 95 80 - 120 108 80 - 120 <0.0050 ug/L NC 207105290 Total Cadmium (Cd) 2013/08/24 99 80 - 120 102 80 - 120 <0.0050 ug/L NC 207105290 Total Chromium (Cr) 2013/08/24 NC 80 - 120 106 80 - 120 <0.10 ug/L 6.9 207105290 Total Cobalt (Co) 2013/08/24 98 80 - 120 104 80 - 120 <0.0050 ug/L 5.6 207105290 Total Copper (Cu) 2013/08/24 94 80 - 120 104 80 - 120 <0.050 ug/L 1.6 207105290 Total Iron (Fe) 2013/08/24 98 80 - 120 105 80 - 120 <1.0 ug/L 2.3 207105290 Total Lead (Pb) 2013/08/24 98 80 - 120 104 80 - 120 <0.0050 ug/L 1.4 207105290 Total Lithium (Li) 2013/08/24 NC 80 - 120 96 80 - 120 <0.50 ug/L 4.2 207105290 Total Manganese (Mn) 2013/08/24 NC 80 - 120 105 80 - 120 <0.050 ug/L 5.4 207105290 Total Mercury (Hg) 2013/08/24 97 80 - 120 105 80 - 120 <0.010 ug/L NC 207105290 Total Molybdenum (Mo) 2013/08/24 NC 80 - 120 105 80 - 120 <0.050 ug/L 3.2 207105290 Total Nickel (Ni) 2013/08/24 NC 80 - 120 108 80 - 120 <0.020 ug/L 3.9 207105290 Total Selenium (Se) 2013/08/24 108 80 - 120 109 80 - 120 <0.040 ug/L NC (2) 207105290 Total Silver (Ag) 2013/08/24 103 80 - 120 84 80 - 120 0.0080, RDL=0.0050 ug/L NC 207105290 Total Strontium (Sr) 2013/08/24 NC 80 - 120 97 80 - 120 <0.050 ug/L 2.3 207105290 Total Thallium (Tl) 2013/08/24 97 80 - 120 107 80 - 120 0.0030, RDL=0.0020 ug/L 0 20

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Matrix Spike Spiked Blank Method Blank RPDQC Batch Parameter Date % Recovery QC Limits % Recovery QC Limits Value UNITS Value (%) QC Limits7105290 Total Tin (Sn) 2013/08/24 97 80 - 120 99 80 - 120 <0.20 ug/L NC 207105290 Total Titanium (Ti) 2013/08/24 110 80 - 120 99 80 - 120 <0.50 ug/L NC 207105290 Total Uranium (U) 2013/08/24 NC 80 - 120 105 80 - 120 <0.0020 ug/L 1.6 207105290 Total Vanadium (V) 2013/08/24 94 80 - 120 102 80 - 120 <0.20 ug/L 10.3 207105290 Total Zinc (Zn) 2013/08/24 101 80 - 120 111 80 - 120 <0.10 ug/L 24.2(3, 2) 207105290 Total Boron (B) 2013/08/24 <50 ug/L 5.8 207105290 Total Silicon (Si) 2013/08/24 <100 ug/L 1.7 207105290 Total Zirconium (Zr) 2013/08/24 <0.10 ug/L NC 207105735 Acidity (pH 8.3) 2013/08/22 93 80 - 120 <0.50 mg/L NC 207105735 Acidity (pH 4.5) 2013/08/22 <0.50 mg/L NC 207106012 Alkalinity (Total as CaCO3) 2013/08/23 NC 80 - 120 101 80 - 120 <0.50 mg/L 9.5 207106012 Alkalinity (PP as CaCO3) 2013/08/23 <0.50 mg/L NC 207106012 Bicarbonate (HCO3) 2013/08/23 <0.50 mg/L 9.5 207106012 Carbonate (CO3) 2013/08/23 <0.50 mg/L NC 207106012 Hydroxide (OH) 2013/08/23 <0.50 mg/L7106156 Conductivity 2013/08/22 99 80 - 120 1.2, RDL=1.0 uS/cm 0.5 207106630 Orthophosphate (P) 2013/08/22 NC 80 - 120 92 80 - 120 <0.0050 mg/L NC 207107191 Nitrate plus Nitrite (N) 2013/08/22 104 80 - 120 104 80 - 120 <0.020 mg/L 1.1 257107193 Nitrite (N) 2013/08/22 103 80 - 120 101 80 - 120 <0.0050 mg/L NC 207107338 Total Nitrogen (N) 2013/08/23 NC 80 - 120 98 80 - 120 <0.020 mg/L 2.4(4) 207107639 Total Oil and grease 2013/08/27 89 70 - 130 <1.0 mg/L7108496 F2 (C10-C16 Hydrocarbons) 2013/08/23 92 80 - 120 98 80 - 120 <0.20 mg/L NC 407108496 O-TERPHENYL (sur.) 2013/08/23 99 50 - 130 96 50 - 130 96 %7108496 F3 (C16-C34 Hydrocarbons) 2013/08/23 <0.20 mg/L NC 407108496 F4 (C34-C50 Hydrocarbons) 2013/08/23 <3.0 mg/L NC 407108496 Reached Baseline at C50 2013/08/23 NC 407108555 D10-ANTHRACENE (sur.) 2013/08/23 116 60 - 130 106 60 - 130 122 %7108555 D8-ACENAPHTHYLENE (sur.) 2013/08/23 106 50 - 130 95 50 - 130 108 %7108555 D8-NAPHTHALENE (sur.) 2013/08/23 99 50 - 130 84 50 - 130 95 %7108555 D9-Acridine 2013/08/23 96 50 - 130 93 50 - 130 98 %7108555 TERPHENYL-D14 (sur.) 2013/08/23 104 60 - 130 109 60 - 130 120 %7108555 Naphthalene 2013/08/23 78 50 - 130 71 50 - 130 <0.10 ug/L NC 407108555 2-Methylnaphthalene 2013/08/23 95 50 - 130 78 50 - 130 <0.10 ug/L NC 407108555 Quinoline 2013/08/23 120 50 - 130 118 50 - 130 <0.50 ug/L NC 407108555 Acenaphthylene 2013/08/23 92 50 - 130 75 50 - 130 <0.050 ug/L NC 407108555 Acenaphthene 2013/08/23 94 50 - 130 73 50 - 130 <0.050 ug/L NC 407108555 Fluorene 2013/08/23 94 50 - 130 82 50 - 130 <0.050 ug/L NC 407108555 Phenanthrene 2013/08/23 91 60 - 130 86 60 - 130 <0.050 ug/L NC 407108555 Anthracene 2013/08/23 96 60 - 130 94 60 - 130 <0.010 ug/L NC 407108555 Acridine 2013/08/23 99 50 - 130 92 50 - 130 <0.050 ug/L NC 40

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Matrix Spike Spiked Blank Method Blank RPDQC Batch Parameter Date % Recovery QC Limits % Recovery QC Limits Value UNITS Value (%) QC Limits7108555 Fluoranthene 2013/08/23 95 60 - 130 94 60 - 130 <0.020 ug/L NC 407108555 Pyrene 2013/08/23 95 60 - 130 95 60 - 130 <0.020 ug/L NC 407108555 Benzo(a)anthracene 2013/08/23 90 60 - 130 94 60 - 130 <0.010 ug/L NC 407108555 Chrysene 2013/08/23 90 60 - 130 94 60 - 130 <0.050 ug/L NC 407108555 Benzo(b&j)fluoranthene 2013/08/23 92 60 - 130 97 60 - 130 <0.050 ug/L NC 407108555 Benzo(k)fluoranthene 2013/08/23 99 60 - 130 106 60 - 130 <0.050 ug/L NC 407108555 Benzo(a)pyrene 2013/08/23 90 60 - 130 97 60 - 130 <0.0090 ug/L NC 407108555 Indeno(1,2,3-cd)pyrene 2013/08/23 95 60 - 130 103 60 - 130 <0.050 ug/L NC 407108555 Dibenz(a,h)anthracene 2013/08/23 93 60 - 130 101 60 - 130 <0.050 ug/L NC 407108555 Benzo(g,h,i)perylene 2013/08/23 90 60 - 130 97 60 - 130 <0.050 ug/L NC 407108789 Dissolved Chloride (Cl) 2013/08/22 94 80 - 120 99 80 - 120 <0.50 mg/L NC 207108894 Dissolved Sulphate (SO4) 2013/08/22 NC 80 - 120 100 80 - 120 <0.50 mg/L NC 207110553 Total Phosphorus (P) 2013/08/23 96 80 - 120 99 80 - 120 <0.0020 mg/L NC 207116413 Total Dissolved Solids 2013/08/27 92 80 - 120 90 80 - 120 <10 mg/L 6.9 207117277 Ammonia (N) 2013/08/26 98 80 - 120 104 80 - 120 0.0058, RDL=0.0050 mg/L 4.0 207121657 Nitrate plus Nitrite (N) 2013/08/27 100 80 - 120 102 80 - 120 <0.020 mg/L NC 257121668 Nitrite (N) 2013/08/27 98 80 - 120 97 80 - 120 <0.0050 mg/L NC 207121672 Total Nitrogen (N) 2013/08/27 NC 80 - 120 93 80 - 120 <0.020 mg/L 3.6 20

N/A = Not ApplicableRDL = Reportable Detection LimitRPD = Relative Percent DifferenceDuplicate: Paired analysis of a separate portion of the same sample. Used to evaluate the variance in the measurement.Matrix Spike: A sample to which a known amount of the analyte of interest has been added. Used to evaluate sample matrix interference.Spiked Blank: A blank matrix sample to which a known amount of the analyte, usually from a second source, has been added. Used to evaluate method accuracy.Method Blank: A blank matrix containing all reagents used in the analytical procedure. Used to identify laboratory contamination.Surrogate: A pure or isotopically labeled compound whose behavior mirrors the analytes of interest. Used to evaluate extraction efficiency.NC (Matrix Spike): The recovery in the matrix spike was not calculated. The relative difference between the concentration in the parent sample and the spiked amount was not sufficiently significantto permit a reliable recovery calculation.NC (RPD): The RPD was not calculated. The level of analyte detected in the parent sample and its duplicate was not sufficiently significant to permit a reliable calculation.(1) - Method blank exceeds 0.2mg/L stipulated in reference method. No other Quality Control measures affected.(2) - Duplicate RPD above control limit - (10% of analytes failure allowed).(3) - Recovery or RPD for this parameter is outside control limits. The overall quality control for this analysis meets acceptability criteria.(4) - RDL raised due to sample matrix interference.

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Validation Signature Page

Maxxam Job #: B374017

The analytical data and all QC contained in this report were reviewed and validated by the following individual(s).

Andy Lu, Data Validation Coordinator

Dina Tleugabulova, Ph.D., Scientific Specialist, Inorganics Department

====================================================================Maxxam has procedures in place to guard against improper use of the electronic signature and have the required "signatories", as per section 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. For Service Group specific validation please refer to the Validation Signature Page.

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DIAVIK DIAMOND MINES INC.Report Date: 2013/08/28 Client Project #: SNP/NI SLUDGEMaxxam Job #: B374017Maxxam Sample: HG6918 Client ID: 1645-18

Hydrocarbons (C10-C30) in Water - GC/FID Chromatogram

Note: This information is provided for reference purposes only. Should detailed chemist interpretationor fingerprinting be required, please contact the laboratory.

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DIAVIK DIAMOND MINES INC.Report Date: 2013/08/28 Client Project #: SNP/NI SLUDGEMaxxam Job #: B374017Maxxam Sample: HG6919 Client ID: 1645-18B



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DIAVIK DIAMOND MINES INC.Report Date: 2013/08/28 Client Project #: SNP/NI SLUDGEMaxxam Job #: B374017Maxxam Sample: HG6919 Lab-Dup Client ID: 1645-18B



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CCME Hydrocarbons (F2-F4 in water) Chromatogram


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DIAVIK DIAMOND MINES INC.Report Date: 2013/08/28 Client Project #: SNP/NI SLUDGEMaxxam Job #: B374017Maxxam Sample: HG6922 Client ID: 1645-75B



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DIAVIK DIAMOND MINES INC.Report Date: 2013/08/28 Client Project #: SNP/NI SLUDGEMaxxam Job #: B374017Maxxam Sample: HG6922 Lab-Dup Client ID: 1645-75B



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DIAVIK DIAMOND MINES INC.Report Date: 2013/08/28 Client Project #: SNP/NI SLUDGEMaxxam Job #: B374017Maxxam Sample: HG6924 Client ID: NI SLUDGE



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Diavik Diamond Mines Inc. P.O. Box 2498 5007 – 50th Avenue...

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